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"It’s confirmed: somebody is trying to pretend to be me on Facebook (and maybe other social media platforms) apparently hitting on a lot of different female fans, trying to get their numbers and who knows what else. I’m not joking," Pratt wrote.

The actor voiced his concern for young social media users. He told fans to make sure any account with his name had a blue "verified" checkmark next to it.

"It terrifies me to think someone could be hurt, their feelings or much worse, by this imposter/potential predator," Pratt said. "I’ve had many, many people tell me about this. It’s not an isolated incident. If anyone is in contact with this person block them immediately.